Cottonwood Grazing #4 Dam Reservoir Report
Nearby: Chicken Of The Sea Kelso #1
Last Updated: December 5, 2025
Cottonwood Grazing #4 Dam, located in Phillips County, Montana, is a gravity dam with a height of 16 feet and a hydraulic height of 12 feet.
°F
°F
mph
Wind
%
Humidity
Summary
Managed by the Bureau of Land Management, this dam has a storage capacity of 51.73 acre-feet and serves the primary purpose of water resource management. While it has a low hazard potential and has not been rated for its condition, the dam has not been inspected since September 2018.
The dam is situated in an unnamed drainage area and spans a length of 264 feet, providing a surface area of 12.48 acres. Despite its small size, the dam plays a crucial role in managing water resources in the region. With its Federal ownership and funding, the Bureau of Land Management oversees its construction, regulation, and inspection. While it has not been modified or assessed for risk management measures, the dam continues to serve its purpose for the local water supply.
For enthusiasts of water resources and climate, Cottonwood Grazing #4 Dam offers a glimpse into the intricate network of dams that help manage water systems across the country. With its unique design featuring buttress and stone core types, this dam showcases the diversity of dam structures in use. While its condition assessment remains unrated, the low hazard potential of the dam indicates a stable and reliable structure for water management in the region.
Dam Length |
264 |
River Or Stream |
UNNAMED DRAINAGE |
Primary Dam Type |
Gravity |
Surface Area |
12.48 |
Hydraulic Height |
12 |
Drainage Area |
2.2 |
Nid Storage |
51.73 |
Structural Height |
16 |
Hazard Potential |
Low |
Foundations |
Unlisted/Unknown |
Nid Height |
16 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Dam Data Reference
Condition Assessment
SatisfactoryNo existing or potential dam safety deficiencies are recognized. Acceptable performance is expected under all loading conditions (static, hydrologic, seismic) in accordance with the minimum applicable state or federal regulatory criteria or tolerable risk guidelines.
Fair
No existing dam safety deficiencies are recognized for normal operating conditions. Rare or extreme hydrologic and/or seismic events may result in a dam safety deficiency. Risk may be in the range to take further action. Note: Rare or extreme event is defined by the regulatory agency based on their minimum
Poor A dam safety deficiency is recognized for normal operating conditions which may realistically occur. Remedial action is necessary. POOR may also be used when uncertainties exist as to critical analysis parameters which identify a potential dam safety deficiency. Investigations and studies are necessary.
Unsatisfactory
A dam safety deficiency is recognized that requires immediate or emergency remedial action for problem resolution.
Not Rated
The dam has not been inspected, is not under state or federal jurisdiction, or has been inspected but, for whatever reason, has not been rated.
Not Available
Dams for which the condition assessment is restricted to approved government users.
Hazard Potential Classification
HighDams assigned the high hazard potential classification are those where failure or mis-operation will probably cause loss of human life.
Significant
Dams assigned the significant hazard potential classification are those dams where failure or mis-operation results in no probable loss of human life but can cause economic loss, environment damage, disruption of lifeline facilities, or impact other concerns. Significant hazard potential classification dams are often located in predominantly rural or agricultural areas but could be in areas with population and significant infrastructure.
Low
Dams assigned the low hazard potential classification are those where failure or mis-operation results in no probable loss of human life and low economic and/or environmental losses. Losses are principally limited to the owner's property.
Undetermined
Dams for which a downstream hazard potential has not been designated or is not provided.
Not Available
Dams for which the downstream hazard potential is restricted to approved government users.
Cottonwood Grazing #4 Dam